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what is a longitudinal study?

changes observed in an individual over time

what is a cross sectional study?

different ages are observed at the same time

What can be one negative consequence of cross sectional study?

cohort effect

what is piaget's theory of cognitive development?

children develop a schema for objects (such as banging). They then assimilate other objects for that schema (banging other objects). When they encounter an object that doesn't fit the schema, they accommodate for that conflict